MILLWRIGHT EXAM NEWEST ACTUAL EXAM COMPLETE
200 QUESTIONS AND CORRECT DETAILED ANSWERS
What are the 2 classes of hydraulics? - ANSWER: Hydrostatic & Hydrodynamic
What causes pressure drop in a hydraulic line? - ANSWER: Excessive Fluid Velocity
What causes aeration in a hydraulic pump? - ANSWER: Air in the suction line
What type of hydraulic cylinder is indicated in the circuit in Figure 1? - ANSWER:
Adjustable cushion on extend only
What is Figure 2? - ANSWER: Pilot Operated check valve with a 5:1 line to pilot
pressure ratio
What valve is internally piloted from the outlet port and externally drained? -
ANSWER: Pressure reducing valve
What valve discharges at a preset pressure? - ANSWER: Pressure Relief Valve
What is the purpose of a pump? - ANSWER: Create Flow
Which valve limits system pressure when using a fixed displacement pump? -
ANSWER: Pressure Relief Valve
What is a symptom of a noisy pump? - ANSWER: Low fluid level in tank
Why can a pressure compensated variable displacement pump work without a
relief? - ANSWER: It shifts to minimum flow
Where is the main purpose pressure relief valve located in a hydraulic system? -
ANSWER: Between Pump & control valve
What instruments are used for testing a hydraulic system? - ANSWER: Tachometer,
flowmeter & pressure guage
What are the brownish deposits found on valve spools? - ANSWER: varnish
what is the flare angle for hydraulic tubing that complies with JIC standards -
ANSWER: 37" included angle
What diameter of hose is required for hydraulic hose fittings that has a dash and
number 12 on it? - ANSWER: 3/4
What is a needle valve normally used for? - ANSWER: throttling
, what is installed when high pneumatic cylinder speeds are required? - ANSWER:
quick exhaust valve
What does figure 3 represent? - ANSWER: Bidrectional, fixed capacity, pneumatic
motor
What does figure 4 represent? - ANSWER: Quick Exhaust valve
What is the area of the rod end of the piston when the cylinder has a diameter of 8"
and the rod a diameter of 2" - ANSWER: 47.10 sq.in.
What is the maximum pressure a transmitter can produce when it has a 10"
diameter low pressure end and a 2" diameter high pressure end and system pressure
relief valve is set to 1000 psi - ANSWER: 25000 psi
What is the minimum diameter of a cylinder ram when a hydraulic jack exerts a force
of 10 tons and pressure guage reads 2500 psi - ANSWER: 3.192
What is the average flow rate when an accumulator that holds 3 gallons of usable oil
discharges in 25 seconds? - ANSWER: 7.2 gpm
What drives the female rotor on a screw compressor? - ANSWER: timing gears
When over hauling a dry screw compressor how are the rotor clearance
specifications determined? - ANSWER: manufacturers manual
What determines the type of air filter used on an air compressor? - ANSWER: duty or
application
What are fins used for on a compressor discharge line? - ANSWER: cool discharge air
what is done to control the output of the screw compressor? - ANSWER: suction
throttling
what is the purpose of a staple in a separator element gasket? - ANSWER: prevent
static electricity build up
What is the advantage of a three lobe blower over a two lobe blower? - ANSWER:
higher operating speeds
how are lobe to lobe clearance changed on lobe blowers? - ANSWER: adjusting
timing gears
how is unloading accomplished on electrically driven oil flooded vane compressors? -
ANSWER: throttling suction
200 QUESTIONS AND CORRECT DETAILED ANSWERS
What are the 2 classes of hydraulics? - ANSWER: Hydrostatic & Hydrodynamic
What causes pressure drop in a hydraulic line? - ANSWER: Excessive Fluid Velocity
What causes aeration in a hydraulic pump? - ANSWER: Air in the suction line
What type of hydraulic cylinder is indicated in the circuit in Figure 1? - ANSWER:
Adjustable cushion on extend only
What is Figure 2? - ANSWER: Pilot Operated check valve with a 5:1 line to pilot
pressure ratio
What valve is internally piloted from the outlet port and externally drained? -
ANSWER: Pressure reducing valve
What valve discharges at a preset pressure? - ANSWER: Pressure Relief Valve
What is the purpose of a pump? - ANSWER: Create Flow
Which valve limits system pressure when using a fixed displacement pump? -
ANSWER: Pressure Relief Valve
What is a symptom of a noisy pump? - ANSWER: Low fluid level in tank
Why can a pressure compensated variable displacement pump work without a
relief? - ANSWER: It shifts to minimum flow
Where is the main purpose pressure relief valve located in a hydraulic system? -
ANSWER: Between Pump & control valve
What instruments are used for testing a hydraulic system? - ANSWER: Tachometer,
flowmeter & pressure guage
What are the brownish deposits found on valve spools? - ANSWER: varnish
what is the flare angle for hydraulic tubing that complies with JIC standards -
ANSWER: 37" included angle
What diameter of hose is required for hydraulic hose fittings that has a dash and
number 12 on it? - ANSWER: 3/4
What is a needle valve normally used for? - ANSWER: throttling
, what is installed when high pneumatic cylinder speeds are required? - ANSWER:
quick exhaust valve
What does figure 3 represent? - ANSWER: Bidrectional, fixed capacity, pneumatic
motor
What does figure 4 represent? - ANSWER: Quick Exhaust valve
What is the area of the rod end of the piston when the cylinder has a diameter of 8"
and the rod a diameter of 2" - ANSWER: 47.10 sq.in.
What is the maximum pressure a transmitter can produce when it has a 10"
diameter low pressure end and a 2" diameter high pressure end and system pressure
relief valve is set to 1000 psi - ANSWER: 25000 psi
What is the minimum diameter of a cylinder ram when a hydraulic jack exerts a force
of 10 tons and pressure guage reads 2500 psi - ANSWER: 3.192
What is the average flow rate when an accumulator that holds 3 gallons of usable oil
discharges in 25 seconds? - ANSWER: 7.2 gpm
What drives the female rotor on a screw compressor? - ANSWER: timing gears
When over hauling a dry screw compressor how are the rotor clearance
specifications determined? - ANSWER: manufacturers manual
What determines the type of air filter used on an air compressor? - ANSWER: duty or
application
What are fins used for on a compressor discharge line? - ANSWER: cool discharge air
what is done to control the output of the screw compressor? - ANSWER: suction
throttling
what is the purpose of a staple in a separator element gasket? - ANSWER: prevent
static electricity build up
What is the advantage of a three lobe blower over a two lobe blower? - ANSWER:
higher operating speeds
how are lobe to lobe clearance changed on lobe blowers? - ANSWER: adjusting
timing gears
how is unloading accomplished on electrically driven oil flooded vane compressors? -
ANSWER: throttling suction
